Common Lisp Quick Guide by noyesno at 2022-02-19 lexical scope labels - give lambda a name 类似于 Javascript 里的局部函数。 (labels ( ( incr (x) (+ x 1) ( decr (x) (- x 1)) ( incr-2 (x) (incr x) (incr x) ) ) (incr 3) (decr 7) ) it's similar with (let ( (x 1) (y 2) ) (+ x y))